【FM Transmitter & AUX Adapter】 Bluetooth FM transmitter can be easily used in cars without built-in bluetooth. It doesn't need to be charged, just plug into a 12-volt outlet and tune to a specific radio station. If your car has a 3.5mm jack, its AUX mode definitely the easiest way to go, it can play straight through your car (no radio frequency required) with true zero distortion sound quality. (Package comes with a 3.5mm AUX cable） 【Hi-fi Bass Boost】 After self-optimizing the sound, this FM transmitter will transmit high-fidelity, well-balanced audio from your device to the car system. Just press the button "b" to Immerse yourself in powerful deep bass and stereo sound.A bass-heavy audio performance makes it ideal for drving, because it's powerful enough to cut through wind noise 【Much Safer Driving Experience】 Bluetooth car adapter mounted to the air vent would be closer to your eye level. It is so nice that you don't need to lower your head. Its comparatively bigger button allows you to easily adjust without worrying about pressing the wrong button. Compared to other adapters that directly plug into the car socket, it does not distract much attention from driving, much safer 【Clearer Calls & Siri/Google Assistant】 Enhanced microphone with 2-3 more sound-collecting ports than other car Bluetooth FM transmitter in the market, making sound pickup easier. The latest CVC 8.0 noise reduction technology can filter out background sounds (such as wind from vents and outside) to get clearer calls on both ends. Long pressing the middle button can also wake up Siri/Google Assistant for GPS audio, stream your music, etc. 【Three Ports Charging&LED Light Design】 Car Bluetooth Adapter can charge three devices simultaneously via one PD 30W Type-C and two QC3.0(18W per) USB charging ports and will auto-assign the best charging efficiency. The PD Port supports iPhone Series/Samsung fast charging. The QC 3.0 port can charge most Android devices from 0% to 60% within 35 minutes. When night comes, LED lights can make it easier for you to find the charging port 【Bluetooth 5.3】 Built-in the latest Bluetooth 5.3 chip, which can provide faster pairing and a more stable connection for uninterrupted music and calls. With a powerful memory function, this Bluetooth radio transmitter for car can auto-reconnect to the last used device every time you get in your car and the audio will auto-resume where it was paused